Facebook cofounder and CEO Mark Zuckerberg understandably has accounts on other social networks – it only makes sense to keep up with what the competition is up to. But that doesn’t mean he bothers to maintain standard security practices on non-Facebook properties. This weekend, his Twitter and Pinterest accounts were hacked. The group responsible, OurMine Team, also claimed to have gained accessed to his zuck Instagram account, but we were not able to independently verify this (Update: See below, his Instagram was not accessed).

We don’t know for sure how OurMine Team pulled off the hacks, but the group is claiming it was all thanks to the LinkedIn password dump from a few weeks ago. Millions of LinkedIn user account details leaked online last month, with the company reacting by invalidating the credentials and contacting affected members to reset their passwords. But the story doesn’t end there, because as we all know, many people like to reuse the same password on different online services.

Including Mark Zuckerberg, apparently.

Twitter was quick to react. While writing this article, we noticed that Zuckerberg’s finkd account had been suspended. Upon publishing, Twitter had already brought it back, with the offending tweet deleted (Zuckerberg hasn’t tweeted anything since January 2012).

This is the best reminder yet that if you have a LinkedIn account, you should go ahead and change your password there, and everywhere else. In fact, you should make it a habit to regularly change your passwords on all your online accounts. And if that is too much of a pain, at the very least make a habit of using different passwords.

In case you were wondering, Zuck’s Google+ account is intact. It’s not clear if that’s because he used a different account and password there or if nobody has bothered to check it yet.

We have contacted Facebook for more information and will update you if we learn more.

Update at 5:55 p.m. Pacific: Facebook confirmed that Zuckerberg’s Instagram account was not accessed, despite what the attackers claimed.

“No Facebook systems or accounts were accessed,” a Facebook spokesperson told VentureBeat in a statement. “The affected accounts have been re-secured.”